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Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Earnings Per Share Disclosure [Line Items]
Net earnings attributable to common stockholders	$ 1,196	$ 15,147	$ 11,614	$ 30,558
Basic weighted-average number of common shares outstanding	47,269	46,499	47,040	46,234
Restricted stock	397	392	442	573
Stock options	168	219	176	329
ESPP		4		15
Diluted weighted-average number of common shares outstanding	47,834	47,114	47,658	47,151
Basic earnings per share	$ 0.03	$ 0.33	$ 0.25	$ 0.66
Diluted earnings per share	$ 0.03	$ 0.32	$ 0.24	$ 0.65

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